This lecture series is as close a companion and critique of Being & Time as I've come across and contains some of the clearest and most profound demonstrations of Heidegger's late thought. Throughout this series, he asks: what is thinking? what calls upon us to think? For Heidegger, the intellectual history of the West has been a deviation from the true content of thought: the thinking about the Being of beings, a notion misunderstood and neglected since Plato. Heidegger is trying to rewind two thousand years of intellectual history to the originary state of the Greek mind, to think as the Greeks thought when Parmenides grappled with Being as the essential question - a mystery for which even mighty Aristotle was afforded no relief. A weighty read & highly recommended for anyone who's read Being & Time without killing themselves.